Paper-pulp screen or dresser



(No Model.)

B. RILEY.

PAPER PULP SGREEN 0R DRESSER.

Patented May 18, 1886.

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NITED' Srarns EDWVIN RILEY, OF FRANKLIN, NEW HAMPSHIRE, ASSIGNOR OF ONE-HALF TO WARREN F. DANIELL, OF SAME PLACE, AND \VILLIAM A. RUSSELL,

OF LAWRENCE, MASSACHUSETTS.

PAPER-PULP SCREEN OR DRESSER.

SPECIFICATION forming part 6r Letters Patent No. 342,0 il, dated May 18, 1886.

Application filed February 17, 1886. Serial No. 192,171. No model.)

To all whom it may concern:

Be it known that I, EDWIN RILEY, of Franklin, county of Merrimac, and State of New Hampshire, have invented an Improvement 5 in Paper-Pulp Screens or Dressers, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to screens or dressers for paper-pulp, and has for its object to provide means by which the slots or interstices of the screen or dresser may be kept in proper condition to facilitate the passage through I 5 them of the paper-pulp in the required state of division.

My invention consists, essentially, of a vat and a screen supported in said vat, combined with a clearer located below said screen, and

20 provided with bars, slats, or wings, to facilitate the passage of the pulp through the screen, in a manner as will be hereinafter fully set forth.

My invention also consists in details of con- 2 strnction, to be hereinafter pointed out in the claims at the end of this specification.

Figure 1 in section shows a sufficient por tion of a screen or dresser to enable my invention to be understood, the section being taken on line so a, Fig. 2; Fig. 2, a plan view of Fig. 1, but on a reduced scale; and Fig. 3, a section of Fig. 2 on line y y, the scale being the same as in Fig. 1.

The vat B, composed of wood or other suit- 5 able material, and having its end a lower than its end a and sides a, is divided by a partition, (0*, which is extended nearly to the bot tom of the said vat. At the inside of the partition at and at the end a and sides a of the o vat, are suitable shoulders, I), for the support of a screen -plate, I), having usual slits, 1)". Below the screen-plate b, and above the vat B, I have placed a clearing device or clearer, D, composed, essentially, of a frame provided with bars, slats, or wings e 0, herein shown as inclined in opposite directions, the said clearer being of less width than the said vat at its i11- ner side, the said clearer having journals 6 which, extended through the frame-work of the vat, support the clearer above the bottom of the vat and close to the under side of the screen-plate, the said clearer having a movement of reciprocation laterally in the said vat below the screen-plate by means of a suitable crank or other device attached to the rod f. 5

As the clearer is reciprocated below the screen, the bars, slats, or wings cause the air in the vat to be at times forced out through the slits, and at other times drive the air and pulp from above the screen into the vat, the said air-currents acting to keep the slits in the screen-plate from clogging or becoming stopped up, the upper sides of the said bars, slats, or wings just below the screen-plate, by acting upon any pulp hanging below the screen, also aiding in keeping the slits of the plate clear.

The pulp, after passing through the screen I), is carried by water through the port or mouth g. The port or mouth 9 is provided with a gate, 9, attached to rods 9', one at each end of said gate, and having an arm, g, pro vided with a threaded opening, through which is passed a threaded spindle, g, the rotation of the spindle in one direction raising the gate g, which travels in a guideway formed by the plate or rod and the side a, thus decreasing the outflow of water and pulp, the rotation of said spindle in the opposite direction moving the gate down to open the mouth or port 9, to permit the outflow of a larger quantity of water and pulp.

I do not desire to limit myself to the mode of arranging the bars, slats, 'or wings a e as herein shown, for the same may be set vertically, or they may be inclined all in the same direction; but I prefer to set the bars, slats, or wings c e as shown, as I am thereby enabled to obtain the best results.

The clearer in its rcciproeations actually prevents the accumulation of any pulpstrings? at the lower side of the screen-plate.

I claim 1. In a paper-pulp screen or dresser, a vat and a screen supported therein, combined 5 with the reciprocating clearer located below said screen, and provided with bars, slats, or wings, to operate substantially as described.

2. In a paper-pulp screen or dresser, a vat to this specification in the presence of two and a screen supported therein, combined subscribing witnesses. with the reci roeatin clearer located below the said seree and povided with bars, slats, EDVIN RILEY 5 or wings arranged at an angle with relation Witnesses:

to each other, substantially as described. v FRANK H. DANIELL,

In testimony whereof I have signed my name WARREN F. DANIELL. 

